Snow load

Snow load & Earthquake load Khan

Dear

Member Registered: 04/17/08 Posts: 2 Loc: Delhi, India

Can any one explain me how to input snowload & earthquake load both in Uniform loads loads column. As i have inpute in puted d the earthquake earthquake load as value of GX,GY & GZ and now want to input the snowload on pipe...? Thanks Regards Yahiya Khan _________________________ Yahiya Khan, Piping Engineer, Alstom Projects India Ltd, Newdelhi India

Top #32569 - 01/13/10 09:16 AM

Richard Ay Member Registered: 12/13/99 Posts: 3220 Loc: Houston, Texas, USA

Re: Snow load & Earthquake load

[Re: Khan]

At the present time, uniform loads have to be all of the same "type". Either all "force / lenth", or all "g's". You cannot mix the two types in the same input file. _________________________ Regards, Richard Ay COADE, Inc., now part of Intergraph Corp.

Top #32577 - 01/13/10 01:25 PM

Itchy Member Registered: 03/10/03 Posts: 178 Loc: n/a


[Re: Richard Ay]

You can enter the snow load over a section of piping by increasing the density of th insulation over the section of piping that will see the snow load _________________________ Miss Itchy

Top #32701 - 01/20/10 04:26 AM

Ohliger Member Registered: 12/16/99 Posts: 136 Loc: Mannheim,Germany Top


[Re: Itchy]

Yes that can Mr. Khan do. But he mixed then the normal isulation loads (weight load case) with a occasiunally load (snow l oad). I think this will be to much for the sustained stress equation.

#32890 - 01/29/10 10:15 AM


[Re: Ohliger]

Michael_Fletcher Another option would be to split the distributed load into a set of discrete loads. Member

Registered: 01/29/10 Posts: 2 Loc: Louisiana, US Top

This can be burdensome if you have extended lengths of pipe.

#32903 - 02/01/10 02:55 AM Michael_Fletcher]

Ohliger Member Registered: 12/16/99 Posts: 136 Loc: Mannheim,Germany


[Re:

I think not so. Example : Its a deflection/stress difference if have a beam between two restraints onetime with a uniformload and one time with two forces on the nodes. In the second case only the restai nts get reaction forces without deflection the beam.

Top #32906 - 02/01/10 04:41 AM

koks Member


[Re: Khan]

snow load can be used as sustain load by density change .... considering there should not be too much difference

Registered: 04/27/09 Posts: 1 Loc: India Top #32979 - 02/03/10 05:45 PM

Itchy


[Re: koks]

I disagree Ohliger

Member Registered: 03/10/03 Posts: 178 Loc: n/a

I believe a snow load should be considered a sustained load. It is a dead lead rather than an occasional load. You can have snow for a significant part of the year (or all year depending where you are). Occasional loads are exactly that - they occur occasionally - wind, seismic, rupture disc disharge loads etc. _________________________ Miss Itchy

Top #32984 - 02/04/10 02:27 AM

Ohliger Member Registered: 12/16/99 Posts: 136 Loc: Mannheim,Germany

Top


[Re: Itchy]

Its a question of the location and load time. Snow load : Florida ==> occasional Alaska ==> sustained Then its only a question of load time, if occasional or sustained. If you have a l ocation with (example 200 days wind) then its a sustained load and not ocassional load.

Snow load

Ryan Member Registered: 11/08/05 Posts: 4 Loc: AL

How to model snow loads in C-II? I already have GX & GZ defined for Seismic laids in vectors 1 & 2. How do I input a snow load of 20psf in this model? I suppose I will also have to add appropriate OCC cases. _________________________ Ryan L.

Top #23154 - 12/11/08 09:38 AM

corne

Re: Snow load

[Re: Ryan]

I mostly add uniform loads to represent wind/snow loads.

Member Registered: 07/09/07 Posts: 275 Loc: The Netherlands Top #23184 - 12/12/08 12:26 AM

shr Member

Re: Snow load

[Re: corne]

Hi Ryan You can use GY for snow load and make another OCC case.

Registered: 02/16/07 Posts: 464 Loc: Singapore Top #23187 - 12/12/08 06:10 AM

Sam Manik

Re: Snow load

[Re: shr]

Additional information: http://www.coade.com/ubbthreads/ubbthrea...=true#Post20070

Member Registered: 04/02/08 Posts: 204 Loc: Jakarta, Indonesia

Edited by Sam Manik ( 12/12/08 06:11 AM )

_________________________

Snow load and shape coefficients for pipe

cr88888 Member Registered: 11/02/04 Posts: 27 Loc: China

Dear all, Are you calculation the snow load for piping? how you input it in the CAESAR II? what is your snow load Shape coefficents for piping? thank you for your comment and advice.

Edited by cr88888 ( 08/09/08 09:09 PM )

_________________________ good luck Top #19868 - 08/11/08 07:23 AM [Re: cr88888]

Re: Snow load and shape coefficients for pipe

Sam Manik

Dear CR 88,

Member

See the last page of attached file.

Registered: 04/02/08 Posts: 204 Loc: Jakarta, Indonesia

Attachments 389-LoadCases.pdf (576 downloads) _________________________ Many thanks & regards, Sam Manik

Top #19875 - 08/11/08 10:17 AM [Re: Sam Manik]

cr88888 Member Registered: 11/02/04 Posts: 27 Loc: China


very thanks to Manik the snow load Shape coefficents for piping noramly is 0.8 or 0.25? _________________________ good luck

Top #19927 - 08/13/08 12:45 AM [Re: cr88888]

Sam Manik Member Registered:


For this item use google _________________________ Many thanks & regards, Sam Manik

04/02/08 Posts: 204 Loc: Jakarta, Indonesia Top #19929 - 08/13/08 02:00 AM [Re: Sam Manik]

mav Member Registered: 01/24/08 Posts: 57 Loc: Russian Federation


In Russian code shape coefficient for snow load is 0.4 (for round crossection)

Edited by mav ( 08/13/08 02:02 AM )

Top #20039 - 08/17/08 11:48 PM [Re: mav]

mksingh Member Registered: 08/17/08 Posts: 1 Loc: India


In case you have both earthquake and snow load, what methodology is used to input in Caesar as all three vectors of earthquake input field are already used by eartquake...where to put the uniform load by snow...p lease advise. Regards MK

Top #20052 - 08/18/08 07:45 AM [Re: mksingh]

MoverZ Member


Coincident snow load and earthquake ..... ? If there were an earthquake, any snow would be shaken off !!!

Registered: 11/22/06 Posts: 531 Loc: Hants, UK Top #20066 - 08/18/08 10:03 AM [Re: MoverZ]

Sam Manik Member Registered: 04/02/08 Posts: 204 Loc: Jakarta, Indonesia


Actually for me, I just think about the coincident of snow and wind. How Caesar considers the increasing the surface of area due to wind load. We can imagine like the wave load to pipe surface due to the marine growth. Thanks in advance. _________________________ Many thanks & regards, Sam Manik

Top #20069 - 08/18/08 10:08 AM [Re: Sam Manik]

Richard Ay Member Registered: 12/13/99 Posts: 3220 Loc: Houston, Texas, USA


Quote:

How CAESAR II considers the increasing the surface of area due to wind load?

Its not. You input the snow load as a "uniform load". CAESAR II has no idea what this represents. If you want to combine snow and wind, then you'll have to do some external computations so that you can use "insulation" to simulate snow. Your insulation thickness needs to be 1/2 the snow depth (because insulation will be on both the top and bottom of the pipe), and then the corresponding density should be determined to yield the correct weight/length of snow. _________________________ Regards, Richard Ay COADE, Inc., now part of Intergraph Corp.

Top #20070 - 08/18/08 10:14 AM [Re: Richard Ay]


Sam Manik

Thanks Sir Richard Ay,

Member

Honestly actually I already guessed that in my heart coz we can set the snow like the insulation with such value of thickness and density. Thanks again.

Registered: 04/02/08 Posts: 204 Loc: Jakarta, Indonesia

Edited by Samsul P. Manik ( 08/18/08 10:15 AM )

_________________________ Many thanks & regards, Sam Manik

Snow load

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